Retirement Benefit Obligations - Schedule of Accumulated Benefit Obligation Exceeds Fair Value of Plan Assets (Detail) - Foreign Pension Benefits [Member] - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 304	$ 622
Accumulated benefit obligation	304	622
Fair value of plan assets	229	509
Funded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	235	550
Accumulated benefit obligation	235	550
Fair value of plan assets	229	509
Unfunded Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	69	72
Accumulated benefit obligation	69	72
Fair value of plan assets	$ 0	$ 0

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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